docs: def rrCellChangeOrder():
      """RR-CELL CHANGE ORDER  Section  9.1.21e"""
      a = TpPd(pd=0x6)
      b = MessageType(mesType=0x8)  # 00001000
      c = CellDescription()
      d = NcModeAndSpareHalfOctets()
      packet = a / b / c / d
      return packet